I'm getting some O2 sensor bungs welded onto my cutom headers and need to know the thread and pitch for the bung/sensors, so my welder guy can order them.
Its for a 03 LS1.

Thanks
Josh

 

"These plugs fit 18 mm x 1.50 pitch oxygen sensor rings which are designed for standard Bosch type Lamda sensors. "

http://stores.channeladvisor.com/ver...20and%20Bungs/

 

You can get them pretty cheap from Jeg's or Innovate
but I recommend not using an Allen plug, they may be
cute but good luck getting them out if they sit for long.
An 18mm Toyota oil drain plug, big hex head, will let
you grief on it but an Allen stainless one will just yield
in the socket and then you're screwed (unscrewed, not).

If you're a cheap bastard and working in plain steel pipe
you can cut down an 18mm spark plug "anti fouling
adaptor" (Help! packs at any chain auto parts store)
and weld that in. Used those on cast iron manifolds
with 1-wire sensors to see cruise mixture, back when.

 

Thanks guys!

Josh